What is CVE-2023-27373?

CVE-2023-27373 is an issue discovered in Insyde InsydeH2O with kernel 5.0 through 5.5, where an attacker can tamper with a runtime-accessible EFI variable to cause a dynamic BAR setting to overlap SMRAM.

How does CVE-2023-27373 affect Insyde InsydeH2O?

CVE-2023-27373 affects Insyde InsydeH2O versions 5.0 through 5.5 by allowing an attacker to tamper with an EFI variable and cause a dynamic BAR setting to overlap SMRAM.

What is the severity of CVE-2023-27373?

The severity of CVE-2023-27373 is rated as medium with a severity value of 5.5.

How can I fix CVE-2023-27373?

To fix CVE-2023-27373, it is recommended to update Insyde InsydeH2O to a version that is not affected by this vulnerability.

Where can I find more information about CVE-2023-27373?

You can find more information about CVE-2023-27373 at the following reference: [https://www.insyde.com/security-pledge/SA-2023035](https://www.insyde.com/security-pledge/SA-2023035)

Vulnerability/
CVE-2023-27373

medium

5.5

CWE

7/8/2023

2/8/2024

CVE-2023-27373: Input Validation

First published: Mon Aug 07 2023(Updated: )

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. Due to insufficient input validation, an attacker can tamper with a runtime-accessible EFI variable to cause a dynamic BAR setting to overlap SMRAM.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
Insyde InsydeH2O	=5.0
Insyde InsydeH2O	=5.1
Insyde InsydeH2O	=5.2
Insyde InsydeH2O	=5.3
Insyde InsydeH2O	=5.4
Insyde InsydeH2O	=5.5

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Reference Links

https://www.insyde.com/security-pledge/SA-2023035

Frequently Asked Questions

What is CVE-2023-27373?
CVE-2023-27373 is an issue discovered in Insyde InsydeH2O with kernel 5.0 through 5.5, where an attacker can tamper with a runtime-accessible EFI variable to cause a dynamic BAR setting to overlap SMRAM.
How does CVE-2023-27373 affect Insyde InsydeH2O?
CVE-2023-27373 affects Insyde InsydeH2O versions 5.0 through 5.5 by allowing an attacker to tamper with an EFI variable and cause a dynamic BAR setting to overlap SMRAM.
What is the severity of CVE-2023-27373?
The severity of CVE-2023-27373 is rated as medium with a severity value of 5.5.
How can I fix CVE-2023-27373?
To fix CVE-2023-27373, it is recommended to update Insyde InsydeH2O to a version that is not affected by this vulnerability.
Where can I find more information about CVE-2023-27373?
You can find more information about CVE-2023-27373 at the following reference: [https://www.insyde.com/security-pledge/SA-2023035](https://www.insyde.com/security-pledge/SA-2023035)

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